Pathology Sudden death, right sided heart failure (cor pulmonale or cardiovascular collapse) occur when – A Small pulmonary embolism B Massive pulmonary embolism C 60% or more of pulmonary artery is obstructed with emboli D End artery obliteration 💡 Explanation Sudden death, right sided heart failure (cor pulmonale or cardiovascular collapse) occur when - ✓ Correct Answer: C. 60% or more of pulmonary artery is obstructed with emboli